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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
Stenosis of the aortic valve creates an obstacle to aortic ejection, thus a gradient of pressure between the left ventricle and the aorta. This gradient of pressure can be measured, using Bernouilli law, by measurement of the maximum velocity across the aortic valve with continuous Doppler. In aortic stenosis, trans-aortic velocity is 3 to 5 m/s. To obtain an accurate measurement, it is crucial to optimize the alignment of the Doppler beam with the jet.